imagerot
Version:
A lightweight, cross-environment image library for applying unique effects via raw image buffers.
58 lines (57 loc) • 2.77 kB
JavaScript
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.chromaticAberration = void 0;
const defaultIntensity = 5;
const global = (_a, ...args_1) => __awaiter(void 0, [_a, ...args_1], void 0, function* ({ data, width }, options = null) {
const { intensity = defaultIntensity } = (options || {});
const rLayer = new Uint8Array(data.length);
const gLayer = new Uint8Array(data.length);
const bLayer = new Uint8Array(data.length);
for (let i = 0; i < data.length; i += 4) {
rLayer[i] = data[i];
gLayer[i + 1] = data[i + 1];
bLayer[i + 2] = data[i + 2];
rLayer[i + 3] = gLayer[i + 3] = bLayer[i + 3] = data[i + 3];
}
const shiftLayer = (layer, offset) => {
const shiftedLayer = new Uint8Array(layer.length);
for (let i = 0; i < layer.length; i += 4) {
const x = (i / 4) % width, y = Math.floor((i / 4) / width);
const shiftedX = Math.max(0, Math.min(width - 1, x + offset));
const shiftedIndex = (shiftedX + y * width) * 4;
shiftedLayer[shiftedIndex] = layer[i];
shiftedLayer[shiftedIndex + 1] = layer[i + 1];
shiftedLayer[shiftedIndex + 2] = layer[i + 2];
shiftedLayer[shiftedIndex + 3] = layer[i + 3];
}
return shiftedLayer;
};
const rShift = Math.floor((Math.random() * 2 - 1) * intensity);
const gShift = Math.floor((Math.random() * 2 - 1) * intensity);
const bShift = Math.floor((Math.random() * 2 - 1) * intensity);
const shiftedRLayer = shiftLayer(rLayer, rShift);
const shiftedGLayer = shiftLayer(gLayer, gShift);
const shiftedBLayer = shiftLayer(bLayer, bShift);
for (let i = 0; i < data.length; i += 4) {
data[i] = shiftedRLayer[i];
data[i + 1] = shiftedGLayer[i + 1];
data[i + 2] = shiftedBLayer[i + 2];
data[i + 3] = data[i + 3];
}
return data;
});
const chromaticAberration = {
name: 'chromaticAberration',
browser: global,
node: global
};
exports.chromaticAberration = chromaticAberration;